/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.jena.system;

import org.apache.jena.sparql.core.Transactional;

/**
 * Transaction wrapper object for use with try-with-resources.
 * See {@linkplain Txn#autoTxn(Transactional, org.apache.jena.query.TxnType)}.
 */
public class AutoTxn
    implements AutoCloseable
{
    private Transactional txn;
    private boolean isTxnStartedHere;

    /** This constructor is called from {@linkplain Txn#autoTxn(Transactional, org.apache.jena.query.TxnType)}. */
    AutoTxn(Transactional txn, boolean isTxnStartedHere) {
        super();
        this.txn = txn;
        this.isTxnStartedHere = isTxnStartedHere;
    }

    public void commit() {
        if ( txn.isInTransaction() ) {
            // May have been explicit commit or abort.
            txn.commit();
        }
    }

    @Override
    public void close() {
        if ( isTxnStartedHere ) {
            if ( txn.isInTransaction() )
                // May have been explicit commit or abort.
                txn.abort();
            txn.end();
        }
    }
}
